Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
In this circuit, the current capacity doubles, but is still of the order of microamps. The...
We found this oscillator in an integrated circuit manual from the 90's. The circuit shows how to...
This regulator can be controlled by a logic signal. The circuit is from an Electronics Now from...